USER S GUIDE · Throughout the manual, important safety considerations are highlighted as follows: WARNING Warning alerts you to a potential hazard. If you do not read and follow

Hand-held CarbonDioxide Meter

GM70USER'S GUIDE

M010139en-AAugust 2001

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Table of Contents

CHAPTER 1GENERAL INFORMATION ............................................................................4

Safety .........................................................................................4Warranty ....................................................................................5

CHAPTER 2PRODUCT DESCRIPTION.............................................................................6

Vaisala's Hand-held CO2 meter GM70 ....................................6Parts description ......................................................................7Probes........................................................................................7

CHAPTER 3TAKEN INTO USE..........................................................................................8

Before taken into use ...............................................................8Turning on and setting language, date and time ..................8

CHAPTER 4MEASURING CARBON DIOXIDE................................................................10

Taken measurements.............................................................10

CHAPTER 5BUTTONS, DISPLAYS AND MENUS..........................................................11

Buttons and navigation..........................................................11Basic display...........................................................................12Graphical display....................................................................12Menus ......................................................................................13

CHAPTER 6SETTINGS ....................................................................................................14

Setting actual pressure value and unit.................................14Setting actual temperature value and unit ...........................14Display settings ......................................................................15

Display units ........................................................................15Rounding .............................................................................16Hold/Save display................................................................16Graphic history.....................................................................17

User interface..........................................................................17Selecting language ..............................................................17Automatic power OFF..........................................................18

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Changing the shortcut keys ................................................ 18Key click and backlight on key press .................................. 19Setting date and time.......................................................... 20

Device information................................................................. 20Reverting factory settings ................................................... 21

Other settings......................................................................... 21Setting the alarm levels ...................................................... 21

CHAPTER 7ANALOG OUTPUT CONNECTION............................................................. 23

Selecting and scaling the analog output ............................. 23

CHAPTER 8RECORDING DATA..................................................................................... 25

Recording ............................................................................... 25Stopping recording................................................................ 26Viewing recorded data........................................................... 27Checking the memory status................................................ 27Deleting all recorded files ..................................................... 27Transferring recorded data to PC......................................... 28Real time monitoring with PC............................................... 28

CHAPTER 9CALIBRATION CHECKING OF FIXED TRANSMITTERS ......................... 29

Field checking of the fixed transmitters.............................. 29Field checking of the GMT220 (without a display) ............. 29

CHAPTER 10ADJUSTING GM220 PROBES.................................................................... 31

General about adjustments................................................... 31Adjustments with reference gases....................................... 32

Equipment needed.............................................................. 32Reference gases................................................................. 32Two-point adjustment procedure ........................................ 33One-point adjustment procedure ........................................ 34

Adjustment with two probes................................................. 35

CHAPTER 11ERROR MESSAGES ................................................................................... 36

CHAPTER 12MAINTENANCE ........................................................................................... 37

Changing the probe ............................................................... 37Changing the filter ................................................................. 38Cleaning .................................................................................. 38Changing the battery pack.................................................... 38Vaisala Service Centres ........................................................ 39

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CHAPTER 13TECHNICAL SPECIFICATIONS ..................................................................40

GM70 Hand-held Carbon Dioxide Meter...............................40GMP221/222 probes combined with GMH70 handle ...........40MI70 Indicator..........................................................................41Accessories.............................................................................42Dimensions in mm (inch) .......................................................43

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CHAPTER 1

GENERAL INFORMATION

SafetyThroughout the manual, important safety considerations arehighlighted as follows:

WARNING Warning alerts you to a potential hazard. If you do not read andfollow instructions very carefully at this point, there is a risk ofinjury or even death.

CAUTION Caution warns you of a potential hazard. If you do not read andfollow instructions carefully at this point, the product could bedamaged or important data could be lost.

NOTE Note highlights important information on using the product.

Chapter 1 _________________________________________________________ General Information

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Warranty

Vaisala hereby represents and warrants all Productsmanufactured by Vaisala and sold hereunder to befree from defects in workmanship or material duringa period of twelve (12) months from the date ofdelivery save for products for which a specialwarranty is given. If any Product proves however tobe defective in workmanship or material within theperiod herein provided Vaisala undertakes to theexclusion of any other remedy to repair or at its ownoption replace the defective Product or part thereoffree of charge and otherwise on the same conditionsas for the original Product or part without extensionto original warranty time. Defective parts replaced inaccordance with this clause shall be placed at thedisposal of Vaisala.

Vaisala also warrants the quality of all repair andservice works performed by its employees toproducts sold by it. In case the repair or serviceworks should appear inadequate or faulty and shouldthis cause malfunction or nonfunction of the productto which the service was performed Vaisala shall atits free option either repair or have repaired orreplace the product in question. The working hoursused by employees of Vaisala for such repair orreplacement shall be free of charge to the client.This service warranty shall be valid for a period ofsix (6) months from the date the service measureswere completed.

This warranty is however subject to followingconditions:

a) A substantiated written claim as to any allegeddefects shall have been received by Vaisalawithin thirty (30) days after the defect or faultbecame known or occurred, and

b) The allegedly defective Product or part shall,should Vaisala so require, be sent to the works ofVaisala or to such other place as Vaisala mayindicate in writing, freight and insurance prepaidand properly packed and labelled, unless Vaisalaagrees to inspect and repair the Product orreplace it on site.

This warranty does not however apply when thedefect has been caused through

a) normal wear and tear or accident;

b) misuse or other unsuitable or unauthorized use ofthe Product or negligence or error in storing,maintaining or in handling the Product or anyequipment thereof;

c) wrong installation or assembly or failure toservice the Product or otherwise follow Vaisala'sservice instructions including any repairs orinstallation or assembly or service made byunauthorized personnel not approved by Vaisalaor replacements with parts not manufactured orsupplied by Vaisala;

d) modifications or changes of the Product as wellas any adding to it without Vaisala's priorauthorization;

e) other factors depending on the Customer or athird party.

Notwithstanding the aforesaid Vaisala's liabilityunder this clause shall not apply to any defectsarising out of materials, designs or instructionsprovided by the Customer.

This warranty is expressly in lieu of and excludes allother conditions, warranties and liabilities, expressor implied, whether under law, statute or otherwise,including without limitation Any implied warrantiesof merchantability or of fitness for a particularpurpose and all other obligations and liabilities ofVaisala or its representatives with respect to anydefect or deficiency applicable to or resultingdirectly or indirectly from the Products suppliedhereunder, which obligations and liabilities arehereby expressly cancelled and waived. Vaisala'sliability shall under no circumstances exceed theinvoice price of any Product for which a warrantyclaim is made, nor shall Vaisala in anycircumstances be liable for lost profits or otherconsequential loss whether direct or indirect or forspecial damages.

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CHAPTER 2

PRODUCT DESCRIPTION

Vaisala's Hand-held CO2 meter GM70

The GM70 hand-held carbon dioxide meter measures volumeconcentration of CO2 gas and displays the result in the units of ppm orpercentage %. The exceptional stability and reliability performance of theGM70 comes from advanced silicon based CARBOCAP sensor.

Basic features of GM70

- both numerical and graphical displays- data logging possibility- tool for checking the reading of fixed CO2 transmitters- tool for adjusting Vaisala GM220 series probes- possibility for an analog output (voltage signal 0...1 V)- optional ready-to-use Windows software enabling easy way to handle

measurement data

Interchangeable probes

By selecting the right probe you can choose the measuring range that bestfits for your application. The calibrated measuring ranges varies from0...2000 ppm to 0... 20 % concentrations of CO2. Refer to Chapters 2 and13 for more details.To change the measuring range you only have tochange the probe.

Tool for adjustments

For adjusting the GMT220 series transmitters, GM70 needs only theprobes. GM70 adjusts and stores the adjusting information to the non-volatile memory of the probes. This enables the true interchangeability ofthe probes.

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Parts description

Figure 1. Hand-held Carbon Dioxide Meter GM70.

ProbesProbes GMP221 and GMP222 can be used with GM70. The following measuring ranges can be selected for the probes:

GMP221 0...2 %, 0...3 %, 0...5 %, 0...10 %, 0...20 % CO2GMP222 0...2000 ppm, 0...3000 ppm, 0...5000 ppm, 0...7000 ppm,

0...10 000 ppm

In order to obtain the best possible performance, it is recommended thatthe measurement range is chosen so that the actual concentrations to bemeasured are roughly in the middle of the measuring range.

1 MI70 indicator2 Probe GMP221 or GMP2223 Handle GMH704 Adjustment button5 Recharger connector6 Connector ports I and II for

probes and cables7 Probe fastener

1

2

3

4

5

6

7

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CHAPTER 3

TAKEN INTO USE

Before taken into use

1. If using alkalines, unscrew the back plate of the indicator and insertthe alkalines. If GM70 is ordered with a rechargeable battery pack, thebattery pack is already in place as shipped from the factory.

2. Recharge the battery pack as follows: Plug in recharger to therecharger connector of the indicator and connect the recharger to wallsocket. A battery symbol in corner of display starts to roll.

- It is not recommended to use GM70 during the first recharging. Lateron GM70 can be used while recharging.

- Duration of recharging depends on the charge level of the battery packbeing 4 hours typical. The recommended first recharging time is 6hours.

3. The battery pack is full when the battery symbol stops to roll.

4. Disconnect the recharger.

Turning on and setting language, date and time

1. Connect the probe to either of the connector ports of the indicator.

2. Press the button.

3. Select the language by using buttons. Confirm by pressingSELECT.

4. The default date presentation format is: date.month.year. To change thedate, select Date and press SET. Change the date by using

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buttons. To confirm the date, press OK. If you want to change theformat, select M/D/Y date format (month/date/year), press ON.

5. The default time presentation format is 24-hour clock. To change thetime, select Time and press SET. Change the time by using arrowbuttons.To confirm the time, press OK. If you want to use 12-hourclock, select 12-hour clock, press ON.

6. Press EXIT. To check and change the enviroment settings, selectYES. Otherwise select NO, basic display appears.

7. To ensure the best possible accuracy, give the actual pressure andtemperature values to GM70 as follows:

- select the pressure setting (P:1013 hPa, default), press UNIT toselect unit (hPa or bar), press SET, set the pressure value byusing arrow buttons. Press OK to save the value.

- select the temperature setting (T:25.0 C°, default), press UNIT toselect unit (°C or °F), press SET, set the temperature value byusing arrow buttons. Press +/- to change the sign of the value.Press OK to save the value.

8. Press EXIT to return to the basic display.

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CHAPTER 4

MEASURING CARBON DIOXIDE

Accuracy of the carbon dioxide measurements is affected by air pressureand temperature in the measurement conditions. For achieving the mostaccurate measurements in high altitudes where the barometric pressure isclearly lower than in the sea level, the actual atmospheric pressure valueshall be set to GM70. The acceptable pressure value range is 700...1300hPa.

NOTE Before measurements, ensure that the air pressure and temperaturesettings are correct. Give the correct settings as instructed on page 14.

Taken measurementsSee Chapter 2 Taken into use if you start the GM70 first time, otherwisefollow instructions below.

1. Connect the probe cable to MI70 indicator's connector port.

2. Press POWER ON/OFF button.

3. Wait about 15 seconds to get the reading. For the most accuratereadings, wait for 15 minutes to reach the full operating state ofGM70.

4. Install the probe to the measuring position. Avoid exhaling near theprobe as this increases the CO2 concentration.

5. The basic display opens, let the reading stabilize.

CAUTION Handle the probe carefully. A strong strike or falling can damage theprobe.

If you need to disconnect the probe, first press POWER ON/OFFbutton to turn the indicator OFF. This ensures that all settings anddata are saved properly.

Chapter 5 __________________________________________________ Buttons, displays and menus

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CHAPTER 5

BUTTONS, DISPLAYS AND MENUS

Buttons and navigation

Press down the POWER ON/OFF button (1) as long as the indicatorturns on/off.

Press the SHORTCUT buttons (2) into activate the functionabove the button.

Press any of the ARROW buttons (3) to open path for the MENUS. Inthe MENUS you can navigate with ARROW buttons.

1 Power ON/OFF

2 Shortcut buttons

3 Arrow buttons

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Basic display

1. Selected unit, ppm or %.

2. Shortcut button Graphic1 changes display into curve mode

3. Shortcut button Hold/Sa1 freezes display and you may save the readinginto the memory.

4. Shortcut button Record1 takes you to the Recording/Viewing menu.

5. State of battery.

6. Pressure and temperature setting.

7. Symbol which indicates that GM70 is communicating with PC. If thePC cable is not connected, this symbol is not shown.

1Graphic, Hold/Sa and Record -functions above the shortcut buttons are set inthe factory. You can however change them to refer other functions (seepage 18).

Graphical displayGraphical display shows you the measurements in the form of a curve.From the curve you can examine the data trend and history of the lastminutes.

1. In the basic display, press Graphic or (alternatively open the MENU,select Recording/Viewing).

2. Graphical display opens. More information on page 17 Graphic history.

3. Press BACK to return to the basic display.

1

4

5 67

2 3

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MenusIn the menus you can change settings and select the functions.

1. Open the main menu by pressing any of the buttons.

2. Press OPEN within 5 seconds. The basic display returns if you donot open the MENU shortly. If this happens, begin with the item 1 again.

3. Move in the menus by using buttons.

4. Select the item with button.5. Press to return to the earlier level.

6. EXIT returns back to normal operation.

Main menu Display menu

Functions menu Recording/Viewing menu

Settings menuEnvironment menu

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CHAPTER 6

SETTINGS

Setting actual pressure value and unit

For achieving the most accurate measurements in high altitudes where thebarometric pressure is clearly lower than in the sea level, the actualatmospheric pressure value shall be set to GM70. The acceptable pressurerange is 700...1300 hPa. Pressure is given in the units of hPa or bar.

Follow the instructions below:

1. Open the MENU; press OPEN

2. Select ENVIRONMENT with press .

3. Select pressure value, press UNIT , press SET.

4. Set the pressure value by using buttons. Press OK tosave the value.

5. Press UNIT to change the pressure unit. Default unit is hPa.


Setting actual temperature value and unit

For achieving the most accurate measurements, the actual temperaturevalue shall be set to GM70. The acceptable temperature range is -20...60°C.

Follow the instructions below:

1. Open the MENU; press OPEN

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2. Select ENVIRONMENT with press OK.

3. Select temperature value, press SET.

4. Set the temperature value by using buttons. Press OK tosave the value.

5. Press UNIT to change the temperature unit. Default unit is °C.


Display settings

→

Display unitsThe unit of the measurement can be selected between ppm and %. Thedefault unit is ppm for measuring ranges with upper limit of 10 000 ppm orless. For measuring ranges with upper limit of 2...20 %, the default unit is%.

1. Open the MENU; press OPEN.

2. Select Display, press .

3. Select Quantities and units, press

4. To change the unit, press UNIT (ppm or %)


6. Press YES, if you want to check the environment settings, otherwisepress NO.

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Rounding

When using % units, you can select two or three decimal display by usingthe Rounding function. The default setting is rounding off (= three decimaldisplay).

1. Open the MENU: press OPEN

2. Select the Display, press

3. Select Rounding.

4. Press ON to have rounding on (two decimal display). Press OFF todeactivate rounding (three decimal display).


Hold/Save display

Hold/Save function enables you to freeze a certain display reading. Thisreading can be saved into the memory.

1. Open MENU: press OPEN.

2. Select Display, press

3. Select Hold/Save display.

4. Press HOLD to freeze the display. The frozen measurement data isdisplayed.

5. Press SAVE to save the reading and EXIT to return to the basicdisplay.

6. You can save several readings with HOLD-SAVE function. The firstlysaved reading is data point 1, secondly saved reading is data point 2 etc.All the individual readings (data points) are stored in a same filemarked with . .The file remains in the indicator memory even if theindicator is switched OFF.

7. To view the saved readings, press Record, select View recorded data,press .

8. Select the file marked with , press . Now you can see the saveddata readings. Press TIMES to see the recording timestamps.



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Graphic history

Graphic history shows you the data curve from the time turning on thedevice.

1. Open the MENU: press OPEN.

2. Select Display, press

3. Select Graphic history, press SHOW to have a graphical history display.

4. To get the statistical info on the graph area (minimum, maximum andmean values), press INFO.

5. To get the curve of the other selected quantities, press NEXT. To getthe curves of the all quantities, press NEXT until text ALL is shown,press ALL.

6. To zoom in the curve, press the arrow button . To zoom out, pressthe button . To move the curve in horizontal directions, press thebuttons .

7. Press BACK and EXIT to return to the basic display.

User interface

→ →

Selecting languageYou can select any of the following languages as an user interfacelanguage: English, German, French, Finnish or Spanish.


2. Select Settings, press .

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3. Select User interface, press .

4. Select Language, press SET.

5. Select the language you want, press SELECT.


If you accidentally select a wrong language, first go back to the basicdisplay by pressing (right) as many times as required, then go to thelanguage selection menu by pressing: , (middle) , , , (middle).

Automatic power OFF

As shipped from factory, GM70 has default setting which turns the poweroff automatically after 5 minutes of inactivity. This is to save battery. Incase you want to change the inactivity time setting to 30 minutes or turnoff the automatic power off function.


2. Select Settings, press

3. Select User interface, press .

4. Select Auto power off, press SET.

5. Select the choice you want, press SELECT.


Changing the shortcut keysAs a default, the three shortcut keys refer to the functions Graphic, Hold/Saveand Record. If needed, a shortcut for the functions can be changed tocorrespond your needs.



3. Select User Interface, press .

4. Select Program shortcut keys, press START.


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5. Press the shortcut key you want to change, f.ex. Hold/Save.

6. If you want to replace Hold/Save with pressure setting function, selectpressure setting by using arrow buttons, Environment→→→→P, press SELECT. Answer YES to confirm your selection, otherwise answer NOand continue from item 4.


Ke

1.

2.

3. 4.

5.

6.

Hold/Save -shortcut key replacedby an pressure setting shortcut key P.

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y click and backlight on key press

Open the MENU: press OPEN.

Select Settings, press .

Select User interface, press .

To turn OFF or ON sound effect while pressing the buttons, selectKey Click and press ON/OFF.

To turn OFF and ON backlight effect while pressing the buttons,select Backlight on key press ON/OFF.

Press EXIT to return to the basic display.

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Setting date and time


2. Select Setting, press .

3. Select Date and time, press .

4. The default date presentation format is day.month.year,f.ex.1.1.2001. To change the date, select Date and press SET.Change the date by using arrow buttons.To confirm the date, press.

OK. If you want to change the format, select M/D/Y date format(month/day/year), press ON/OFF.

5. The default time presentation format is 24-hour clock. To change thetime, select Time and press SET. Change the time by using arrowbuttons.To confirm the time, press OK. If you want to change theformat, select 12-hour clock, press ON/OFF.

6. Press EXIT.

Device information

The basic information about the indicator and the probe is found asfollows:

1. Open the MENU: press OPEN2. Select Settings, press .3. Select Device information, press SHOW.4. The first display gives the information on the MI70 indicator. Press

MORE to get the information on the probe. Press OK and EXITto return to the basic display.

Indicator information Probe information

Serial number of theMI70 indicator

Software version ofthe probeSoftware version of

the MI70 indicatorLocation or device ofthe last adjustment(Alternatives: Vaisala,GM70 or GMK220)


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Reverting factory settings

Factory settings of the indicator can be reverted to clear all changedsettings and data memory of the indicator. Reverting factory settings of theindicator does not effect on probe calibration.



3. Select Factory settings, press REVERT. Press YES to confirm thereverting.

4. The power turns off automatically. When switching on again, thefactory settings are reverted. You shall set the language, date andtime again. See Chapter 3.

Other settings

→

Setting the alarm levelsTwo alarm levels can be set. Alarming state is OFF in between thesetpoints. Alarming state is ON when CO2 concentration is below level 1or above alarm level 2. For example, if you want to set ON the alarm whenconcentration exceeds 1000 ppm, set the first level as 0 ppm and thesecond level as 1000 ppm. When alarming is ON, GM70 starts to beep anddisplay back light starts to blink.


2. Select Functions, press .

3. Select Alarm, press .

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4. Select the first limit, press SET (if the alarm function is ON, take itOFF). Set the alarm level by using arrow buttons. Press OK to savethe setting.

5. If needed, select the second limit, then follow instructions from item6. The alarm will go off when the upper limit is exceeded or whenlower limit is gone below.

6. Select Alarm ON/OFF, press ON to activate the alarm and return backto the basic display.

7. A note picture sign appears on the upper left corner.

8. When the alarm level is reached, you can stop alarming by pressing OK. To reactivate the alarm function, answer YES. To stop the

alarm function completely, answer NO.

Chapter 7 _____________________________________________________Analog output connection

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CHAPTER 7

ANALOG OUTPUT CONNECTION

Selecting and scaling the analogoutput

→ ..→..

To get analog measurement data, you need an analog output signal cable,see list of accessories on page 42. One scalable voltage signal channel0...1.0V is available. You can scale the output to any output range but it isrecommended to have the scaling within probe's measuring range to getaccurate measurements.

1. Connect the analog output signal cable connector to the indicatorbase connector. Connect the screw terminal block as follows:Brown wire: common wire (-)Yellow-green wire: signal (+)


3. Select Functions, press .

4. Select Analog output, press .

5. Select 0.0 V to set the value for the 0.0V output signal, press SET.(If the analog output is ON, take it OFF) Set the low value by usingarrow buttons. Press OK to make the setting.

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6. Select 1.0V to set the value for the 1.0V output signal, press SET.Set the high value by using arrow buttons. Press +/- button tochoose the sign of the value. Press OK to make the setting.

7. Select Analog output on/off, press ON to activate the analog output andreturn back to the basic display.

8. A wire picture sign appears on the upper left corner of the basicdisplay.

9. To deactivate the analog output function, go toMENU→→→→ Functions→→→→ Analog output→→→→Analog output on/off and press OFF.

Chapter 8 _____________________________________________________________ Recording data

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CHAPTER 8

RECORDING DATA

Recording

→

You can record measurement data and view the recorded data on thedisplay.

1. Press the shortcut Record, (alternatively open the MENU, selectRecording/Viewing).

2. Select Record data, press .

3. To change interval, select Interval, press SET.

4. Select measurement interval with arrow buttons. Measurementintervals and the maximum recording times are shown in the tablebelow.

Measurement interval Maximum recording duration (=memory full)1 second 45 minutes5 seconds 3 hours

15 seconds 11 hours30 seconds 22 hours1 minute 45 hours5 minutes 9 days

15 minutes 28 days30 minutes 56 days

1 hour 113 days3 hours 339 days

12 hours 1359 days

5. Press SELECT.

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6. To set the recording duration, select Duration, press SET.

7. Select the recording duration with arrow buttons ans press SELECT.

8. Start recording: select Start/Stop recording, press START. If you choose'Memory full', you see the maximum recording time on the display.You can also delete files to empty memory. Press START again toaccept maximum recording time.

9. It is recommended to have power on during recording to get the mostaccurate measurements. In long lasting recordings, power GM70 viathe charging adapter. Ensure that the automatic power off function isdeactivated. In battery use, you can switch off power duringrecording to save battery, however, then the accuracy is notnecessarily within accuracy specifications. Display message tells youthat recording continues undisturbed even when power is off. If theindicator is switched off during recording, the progress bar isshown on the display every 10 seconds (all the time, if chargingadapter is connected).

CAUTION Do not disconnect the probe when the data recording is on,even if the indicator is off. This may cause loss of recordeddata.

Stopping recording

1. To stop recording press Record, select Record data and press ,select Start/Stop recording and press STOP.

2. Now you can go and see the recorded file by selecting SHOW.

You can save individual measurement data points with Hold/Save functiondescribed in page 16.

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Viewing recorded data1. Open the MENU: press OPEN .

2. Select Recording/Viewing, press .

3. Select View recorded data, press .

4. Select the file you want to view, press . The files are identifiedaccording to the starting date and time of recording.

5. Press GRAPH to get the graphical view, press TIMES to get therecording timestamps (press VALUES to go back the recordingvalues).


Checking the memory status

You can check how much there is free space in the memory.

1. Open the MENU: press OPEN .


3. Select Memory status, press SHOW to see the amount of memory inuse and the estimated free space.

4. To return to the basic display, press OK and EXIT.

Deleting all recorded files

The data memory can be cleared as follows:



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3. Select Clear data memory, press CLEAR. Press YES to confirmdeletion of all recorded data files.

4. To return to the basic display, press EXIT.

Transferring recorded data to PC

The recorded data can be transferred to a PC by using MI70 Link program.MI70 Link program can be ordered from Vaisala, see list of accessories onpage 42. You can examine the recorded data easily in Windows

environment and transfer it further to a spreadsheet program (such asMicrosoft Excel) to be modified.

Real time monitoring with PC

You can monitor GM70 readings directly with a PC by using MI70 Linkprogram. MI70 Link program can be ordered from Vaisala, see list ofaccessories on page 42.

Chapter 9 ________________________________________ Calibration checking of fixed transmitters

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CHAPTER 9

CALIBRATION CHECKING OF FIXEDTRANSMITTERS

Field checking of the fixed transmitters

A simple field calibration checking can be done by using GM70 as areference for fixed transmitters.

1. Set the GM70 probe next to the transmitter to be checked. Avoidexhaling towards the probe as this alters the CO2 concentration anddisturbs the readings.

2. Compare the readings of GM70 and the transmitter to be checked.

3. Adjust the transmitter if the difference between the readings isconsidered remarkable (taken into account both the accuracy of thetransmitter and the accuracy of GM70).

Field checking of the GMT220 (without a display)

Follow the instructions below to check the operation of a GM220 seriesprobe.

1. Check the display reading of GM70.

2. Turn off GM70.

3. Detach the GM70's probe as follows:

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- loosen the plastic probe fastener (item 7, Figure 1) by unscrewing itabout 5 turns

- take a firm hold from the base of the probe and pull strongly until theprobe comes loose.

4. Detach the GM220 probe from the transmitter base (open the cover,loosen the tightening screw and pull out the probe).

5. Insert the GM220 probe to GM70 handle as deep as possible. Turn theprobe inside the handle until you feel that a step in the probeconnector snaps into the groove of the probe handle connector andlocks the probe.

6. Tighten the probe fastener.

7. Turn on GM70.

8. Compare the readings of GM70 and the transmitter probe to bechecked.

9. The difference between the readings should be should be less than 5 %of the full scale reading of the transmitter to be checked. If there isneed for an adjustment, please contact Vaisala SSD Service orVaisala's representative.

Chapter 10 ____________________________________________________ Adjusting GM220 Probes

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CHAPTER 10

ADJUSTING GM220 PROBES

General about adjustmentsGM70 is fully calibrated as shipped from factory. Adjustment shall bedone only if there is a reason to believe that the probe is not within theaccuracy specifications. In the adjustment, the reading of interchangeableprobe is changed to correspond to the reference value(s). Adjustments canbe carried out in Vaisala Service Centers or in other laboratory conditions.

The adjustment can be done

- by using reference gases and field check adapter

- by comparing two probes: one to be adjusted and another, calibratedprobe.

Go to the adjustment mode by pressing the adjustment button (Figure 2)located in the probe handle.(The GMH handle do not meet the IP65classification requirements after removal of the screw that covers theadjustment button).

Figure 2. Adjustment button.

Adjustmentbutton.(Beforeadjusting, takeout the screwwhich coversthe button).

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Adjustments with reference gases

Equipment needed

For the adjustment procedure with gases, you need the probe to beadjusted, accurate reference gas(es), a pressure regulator, a flow meter, thefield check adapter (can be ordered from Vaisala) and flexible tubing with3 mm (1/8") inner diameter.

Reference gasesTo achieve reliable results reference gases shall be traceable to appropriatestandards (for example NIST).

- If adjustment is done by using one reference gas (one-pointadjustment), concentration of the gas shall be near to the concentrationvalues in which the device is used.

NOTE It must be noted that when adjustment is done only in one point, thisresults high accuracy only near to the adjustment point, notnecessarily over the whole measurement range.

- If adjustment is done by using two reference gases (two-pointadjustment), the measuring range shall be in between the referenceconcentration levels. The low end concentration shall be less than 20% of the measuring range of the probe. The zero gas can be N2 gaswith a purity of N50 (or better). The high end gas can be mixture ofCO2 and N2 with concentration near to the upper limit of themeasuring range being 110 % of the range at maximum. Accuracyshall be 1 % (or better). Difference between the reference gasconcentrations shall be more than 20 % of the measuring range.


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Two-point adjustment procedure

1. Insert the probe into the field check adapter (as deep as possible, theperforated filter cover shall be completely inside the adapter).

Field check adapter

2. Connect tubing to the bottom port of the adapter.

3. Connect the adapter with the tubing to the flow meter, the pressureregulator and further to the low end reference gas bottle. The sideport of the adapter is left open for gas outflow.

4. Let the low end reference gas flow with flow rate of 0.6 l/min forabout 5 minutes.

5. Take out the screw from the GM70 probe handle to expose theadjustment button (see Figure 2, page 31). Press the button with asmall screwdriver. When pressing the button, indicator turns toadjusting mode.

5. Press OK to confirm the adjusting.

6. Select CO2, press SELECT.

7. Press YES to give the ambient pressure and temperature values. Tocontinue adjusting press EXIT.

8. Now the adjustment mode is on. Press GRAPH to follow if thereadings are stabilized. Go back and press ADJUST to select theadjustment method.

9. Select 2-point adjustment, press SELECT. Press READY if the value isstabilized in the lower reference concentration.

10. Give the lower reference concentration value by using the arrowbuttons. Press OK.

11. Take out the tubing from the low end gas bottle and connect it to thehigh end gas bottle.

12. Let the high end reference gas flow with flow rate of 0.6 l/min forabout 5 minutes.

Bottom port for tubing

Inlet for probe

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13. Press READY when the value is stabilized in the higher referenceconcentration.

14. Give the high end reference concentration value by using the arrowbuttons. Press OK.

15. Confirm the adjustment, press YES.By pressing NO you returnto adjustment mode display.(If the difference between two referencesis less than 20 % of the measuring range of the probe, adjustmentcan not be done).

16. Adjustment is made. Press BACK-EXIT to return to the basic display.

17. Shut off the gas flow.

18. Replace the screw onto the adjusting button.

One-point adjustment procedure

1. Insert the probe into the field check adapter (as deep as possible, theperforated filter cover shall be completely inside the adapter).

2. Connect tubing to the bottom port of the adapter.

3. Connect the adapter with the tubing to the flow meter, the pressureregulator and further to the low end reference gas bottle. The sideport of the adapter is left open for gas outflow.

4. Let the reference gas flow with flow rate of 0.6 l/min for about 5minutes.

5. Take out the screw from the GM70 probe handle to expose theadjustment button (Figure 2, page 31). Press the button with a smallscrewdriver. When pressing the button, indicator turns to adjustingmode.

6. Press OK to confirm the adjusting.


8. Press YES to give the ambient pressure and temperature values. Tocontinue adjusting press EXIT.


10. Select 1-point adjustment, press SELECT. Press READY if the value isstabilized.


VAISALA________________________________________________________________________ 35

11. Give the reference concentration value by using the arrow buttons.Press OK.

12. Confirm the adjustment, press YES.By pressing NO you returnto adjustment mode display.


14. Shut off the gas flow.


Adjustment with two probes

You need to have two probe handles and two probes: one calibrated probeand the other probe to be adjusted. Adjustment is recommended to becarried out near to the concentration values in which the device is used andin stable environment.

1. Connect the probes to the connectors I and II in the bottom of theindicator.

2. Turn on GM70.

3. Take the probe you want to adjust. Unscrew the probe handle screwto expose the adjustment button (Figure 2, page 31). Press the buttonwith a small screwdriver. When pressing the button, indicator turnsto adjusting mode.


5. Press YES to give the ambient pressure and temperature values.Remember to check that pressure and temperature values are thesame with both probes. To continue adjusting press EXIT.


7. Select To same as CO2, press SELECT and YES.



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CHAPTER 11

ERROR MESSAGES

Error Message Interpretation and action

Difference too big The adjustment cannot be made if the difference between the measured concentration and thegiven value is more than 20% of the maximum value of the probe's measuring range. Thismessage can be caused by a considerable high drifting error of the probe.

Please, contact Vaisala or send the probe to Vaisala Service, see page 39.

Value too high The reference concentration can be at highest 110 % of the maximum value of the probe'smeasuring range.

Make the adjustment by using lower reference gas concentration.

Lower value toohigh

The lower reference gas concentration shall be less than 20 % of the maximum value of theprobe's measuring range.


Higher value toohigh

The higher reference gas concentration shall be at highest 110 % of the maximum value of theprobe's measuring range.


Values too close The difference between the reference concentrations shall be at minimum 20 % of themaximum value of the probe's measuring range.

Make the adjustment by using correct reference gas concentrations, see above.

Probe error:Reboot

This error can occur when changing the probe while power is on. Switch off power andconnect the probe properly. Switch on power.

Probe error This error can occur when changing the probe while power is on.

Switch off power and check that a probe is connected properly: Unscrew the probe fastener.Insert the probe to the handle as deep as possible. Turn the probe inside the handle until youfeel that a step in the probe connector snaps into the groove of the handle connector and locksthe probe. Tighten the probe fastener. Switch on power.

Adapter error Switch off power and check that the probe is connected properly, see the instructions of Probeerror. In case of continuous error, contact Vaisala or send the probe to Vaisala Service, seepage 39.

Chapter 12 ______________________________________________________________Maintenance

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CHAPTER 12

MAINTENANCE

Changing the probe1. Turn off GM70.

2. Detach the probe as follows (see Figure 3):

- loosen the plastic probe fastener by unscrewing it about 5 turns- take a firm hold from the base of the probe and pull strongly

until the probe comes loose.

3. Insert a new probe to the handle as deep as possible. Turn the probeinside the handle until you feel that a step in the probe connectorsnaps into the groove of the probe handle connector and locks theprobe.

4. Tighten the probe fastener.

5. Turn on GM70.

Figure 3. Detaching the probe.

2.Pull the probe out firmly

1.Unscrew the probefastener (about 5turns).

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Changing the filter

Spare filters can be ordered from Vaisala, see list of accessories on page42.

1. Remove the plastic grid by pulling it out.

2. Remove the filter paper.

3. Insert a new filter paper and plastic grid.

CleaningWipe the plastic parts of the device with damp paper or towel. Mildwashing agents can be used. Do not let water flow down to electronicsthrough the button holes.

Changing the battery pack

New rechargeable battery packs can be ordered from Vaisala. Change thebattery pack as follows:

1. Open the back plate of the indicator by opening the screw of the backplate.

2. Remove the old battery pack. Detach the black connector by pulling upcarefully from the wires.

3. Connect the black connector of the new battery pack, ensure that theposition of the connector is as indicated in Figure 4 (red and black wiresare on the upper edge of the connector). Do not push the connector withconducting material

4. Place the battery pack, close the back plate and tighten the screw.

5. Charge the battery pack before use, see page 8.

Chapter 12 ______________________________________________________________Maintenance

VAISALA________________________________________________________________________ 39

In case you are installing battery pack and you have a device with alkalinebatteries, remove the metal contact before installing the battery pack.

Figure 4. Installing the battery pack.

Vaisala Service Centres

Vaisala SSD Service Centres

Vaisala SSD Service, Vanha Nurmijärventie 21 FIN-01670 Vantaa, FINLAND.Phone: +358 9 8949 2658, Fax +358 9 8949 2295

Vaisala KK, 42 Kagurazaka 6-Chome, Shinjuku-Ku, Tokyo 162-0825, JAPAN.Phone: +81 3 3266 9611, Fax +81 3 3266 9610

Vaisala Inc., 100 Commerce Way, Woburn, MA 01801-1068, USA.Phone: +1 781 933 4500, Fax +1 781 933 8029

Internet: http://www.vaisala.comTechnical support: [email protected]

Black connector

A (2WHT Connectorposition:White wiresbelow.

Metal contact

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CHAPTER 13

TECHNICAL SPECIFICATIONS

GM70 Hand-held Carbon Dioxide Meter

General

Storage temperature -40 ...+70 °CStorage humidity range 0...100 % non condensing

Electromagnetic compatibility

Complies with the following standard:EN 61326-1:1997 +Am1:1998, Electrical equipment for measurement, control andlaboratory use - EMC requirements; Generic environment.

GMP221/222 probes combined with GMH70handle

Measuring ranges

GMP221 0...2 %, 0...3 %, 0...5 %, 0...10 %, 0...20 %GMP222 0...2000 ppm, 0...3000 ppm, 0...5000 ppm, 0...7000 ppm,

0...10000 ppm

Accuracy at 25°C against certified factory references (including repeatability andcalibration uncertainty)

GMP221 <±[0.02 % CO2 + 2% of reading]GMP222 <±[20 ppm CO2 + 2% of reading]

Chapter 13 _____________________________________________________Technical Specifications

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Non-linearity <±0.5 %FS

Temperature dependence 0.1 %FS / °C (reference 25 °C/ 77 °F)Pressure dependence 0.15 % of reading/hPa (reference 1013 hPa)Long-term instability <±5 %FS / 2 yearsResponse time (63%) 20 seconds (GMP221)

30 seconds (GMP222)

Warm-up time 30 seconds15 min full specification

Operation temperature -20...+ 60 ° COperation pressure 700...1300 hPa

GMH70 handle material ABS/PC-blendProbe fastener AluminiumProbe material PC

MI70 IndicatorIndicator general

Operating temperature range -10...+ 40 °COperating humidity change non condensing

Menu languages English, German, French, Finnish and SpanishDisplay LCD with backlight

Graphic trend display of any quantityCharacter height up to 16mm

Probe inputs 1 or 2Power supply Rechargeable NIMH battery pack with AC-POWER or 4 x

AA size alkalines, type IEC LR6Analog output 0...1 VDCOutput resolution 0.6 mVAccuracy 0.2 % full scaleTemperature dependence 0.002 %/°C full scaleMinimum load resistor 10 kohm to ground

Data interface RS232CData logging capacity 900...2700 real time data points,Logging interval 1 s to 12 hLogging duration 1 min ... memory fullAlarm Audible alarm functionHousing classification IP54Weight 400 gHousing material ABS/PC-blend

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Battery pack

Operation times incontinuous use (one probe) 8 h typical at +20 °Cdata logging use (one probe) up to 30 days (1 hour measurement interval)

Power consumption during charge 10 W maxCharging time 4 hour typical

AccessoriesDescription Order codeEuro AC-adapter MI70EUROADAPTERUK AC-adapter MI70UKADAPTERUS AC-adapter MI70USADAPTERAUS AC-adapter MI70AUSADAPTERMeasurement indicator (battery packincluded)

MI70

MI70 Link- software interface kit MI70LINKAnalog output signal cable 27168ZZCarrying case MI70CASESpare probe (use the order form to definemeasurement range)

GMP221, GMP222

Handle GMH70Spare filter for GMP221 25378GMSPSpare filter for GMP222 25879GMSPField check adapter 26150GM

Chapter 13 _____________________________________________________Technical Specifications

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Dimensions in mm (inch)

Documents

USER S GUIDE · Throughout the manual, important safety considerations are highlighted as follows: WARNING Warning alerts you to a potential hazard. If you do not read and follow